one gaming GPU and 2 other non-game GPUs. how bad will this be?

giantbucket

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my current home machine (which i primarily use for work / trading) is this:

i5-3570k
ASRock Z77 Extreme 3 board
stock clocking (no OC - yet)
8G of DDR3-1600 ram
Win8.1 on 128G SSD
many storage hard drives

here's the tough part - i run 8 monitors (2 landscape + 6 portrait), which means i have 3 cards installed: two GT640's and a GT610. and i'm using the i5's graphics as well but only because the cards don't support UEFI boot screens.

since the CPU and mobo are probably great for a gaming setup, and i'm already on an SSD and have plenty of hard drive space, i COULD move the cards around and drop in some kick-ass gaming graphics card in the first slot, keeping the GT640 cards in the 2nd and 3rd slot.

how bad (negatively speaking) would this be? like, if i were to run a GTX760 to one screen, and a GT640 to 4 screens, and the last GT640 to 3 screens. the 760 would come from another build that i have.

or - i could have the 760 drive 3 portrait screens, and the GT640's driving the remaining 5 screens.

thoughts? (assume the psu is sufficient or will get replaced if needed)
 
Solution
The performance would be normal on the one you setup to game on. The only downside is the top card will likely get hotter than normal as a result of poor airflow. This might make it a bit noisier than normal. You'll be limited to 3 screens, if they are connected to it. I'd also recommend a 3Gb card over a 760. The 760 isn't holding up all that well with the newest games. Perhaps an AMD x280 or 7950 would be a better choice. In newer games, they are holding up a lot better.
The performance would be normal on the one you setup to game on. The only downside is the top card will likely get hotter than normal as a result of poor airflow. This might make it a bit noisier than normal. You'll be limited to 3 screens, if they are connected to it. I'd also recommend a 3Gb card over a 760. The 760 isn't holding up all that well with the newest games. Perhaps an AMD x280 or 7950 would be a better choice. In newer games, they are holding up a lot better.
 
Solution